Method for operating a hearing device and a hearing device

A method for operating a hearing device comprising an ambient microphone (1), a signal processing unit (2), a receiver (3) and an ear canal microphone (4), the method comprising the steps of:

• picking up an ambient sound at an input of the ambient microphone (1) which provides a first audio signal at an output of the at least one ambient microphone (1) representing the ambient sound;
• processing the first audio signal in the signal processing unit (2) which provides a processed audio signal;
• applying the processed audio signal to an input of the receiver (3) which outputs at an output of the receiver (3) sound into an ear canal of a user of the hearing device;
• picking up an ear canal internal sound at an input of the ear canal microphone (4) which provides a second audio signal at an output of the ear canal microphone (4) representing the ear canal internal sound;
• characterised by
• filtering the processed audio signal with a first filter (7) having a transfer function at least comprising a transfer function from the output of the receiver (3) to the input of the ear canal microphone (4) when the hearing device is turned on and being worn in an ear canal of the user, the first filter (7) providing a filtered second audio signal;
• computing a difference between the second audio signal and the filtered processed audio signal resulting in a third audio signal;
• and
• detecting a presence of own-voice of the user based on the third audio signal.